To solve this question we have to make deduct these 2 years. 2109 minus 1989 will give the answer.
You are 120 years old.
(1440 months are passed.)
From 1989 to 2109 there are 120 years. If you want to learn your age in 2109 (born in 1989) your age is 120.
Let's see what will be your age if you born +1 or -1 from that date.